Showing papers by "Hermann Kolanoski published in 1998"
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TL;DR: In this article, photo-production of ψ(2S) mesons has been observed at HERA for photon-proton center-of-mass energies in the range 40 to 160 GeV.
26 citations
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TL;DR: In this article, the double-differential inclusive di-jet cross section in photoproduction processes is measured with the H1 detector at HERA and the cross section is determined as a function of the average transverse jet energy.
Abstract: The double-differential inclusive di-jet cross section in photoproduction processes is measured with the H1 detector at HERA. The cross section is determined as a function of the average transverse jet energyETjets for ranges of the fractional energyξγjets of the parton from the photon side. An effective leading order parton distribution in the photon is determined at large parton fractional energies for scale between 80
23 citations
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TL;DR: In this article, the properties of hadron production in diffractive deep-inelastic positron-proton scattering were studied using data collected in 1994 by the H1 experiment at HERA.
15 citations
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Centre national de la recherche scientifique1, École Polytechnique2, Slovak Academy of Sciences3, Intas Biopharmaceuticals4, Particle Physics and Astronomy Research Council5, DSM6, Academy of Sciences of the Czech Republic7, University of Kiel8, Technical University of Dortmund9, Queen Mary University of London10, Heidelberg University11, Lund University12, University of Birmingham13, Lebedev Physical Institute14, Charles University in Prague15
21 Feb 1998-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this paper, a large sample of fine mesh phototubes of the types Hamamatsu R5505 and R5506 was tested in fields of up to 1.2T.
Abstract: The new lead/scintillating-fibre calorimeter (“SpaCal”) for the backward region of the H1 experiment at HERA (DESY) is equipped with fine mesh phototubes which operate in a magnetic field close to 1 T. A large sample of these tubes of the types Hamamatsu R5505 and R5506, and Hamamatsu R2490-05, have been tested in fields of up to 1.2T. We have investigated the cathode homogeneity with and without magnetic field, the gain loss under the influence of the magnetic field, and stability with time. For a subsample of tubes, we have performed additional studies on stability with respect to temperature changes, variation of gain as a function of the magnetic field, high voltage discharges, single photo-electron response, and linearity. We finally summarize the experience with these tubes after one year of operation in the experiment.
4 citations
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TL;DR: In this article, the ARGUS detector at the e + e − storage ring DORIS II has measured the Michel parameters ρ, ξ, and ξδ for τ ± →l ± ν ν decays in τ -pair events produced at center of mass energies in the region of the ϒ resonances.
4 citations